如題，PHP如何自動識別第三方Restful API的內容，自動渲染成 json、xml、html、serialize、csv、php等數據？

其實這也不難，因為Rest API也是基于http協議的，只要我們按照協議走，就能做到自動化識別 API 的內容，方法如下：

1、API服務端要返回明確的 http Content-Type頭信息，如：Content-Type: application/json; charset=utf-8Content-Type: application/xml; charset=utf-8Content-Type: text/html; charset=utf-8

2、PHP端(客戶端)接收到上述頭信息后，再酌情自動化處理，參考代碼如下：<?php // 請求初始化$url = "//www.yinxi.net";$ch = curl_init();curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);// 返回的 http body 內容$response = curl_exec($ch);// 返回的 http header 的 Content-Type 的內容$contentType = curl_getinfo($ch, "content_type");// 關閉請求資源curl_close($ch);// 結果自動格式輸出$autoDetectFormats = array( "application/xml" => "xml", "text/xml" => "xml", "application/json" => "json", "text/json" => "json", "text/csv" => "csv", "application/csv" => "csv", "application/vnd.php.serialized" => "serialize");if (strpos($contentType, ";")){ list($contentType) = explode(";", $contentType);}$contentType = trim($contentType);if (array_key_exists($contentType, $autoDetectFormats)){ echo "_" . $autoDetectFormats[$contentType]($response);}//+++++++++++++++++++++++++++++++++++++++++++++++++++++++// 常用 格式化 方法//+++++++++++++++++++++++++++++++++++++++++++++++++++++++/** * 格式化xml輸出 */function _xml($string){ return $string ? (array)simplexml_load_string($string, "SimpleXMLElement", LIBXML_NOCDATA) : array();}/** * 格式化csv輸出 */function _csv($string){ $data = array(); $rows = explode("", trim($string)); $headings = explode(",", array_shift($rows)); foreach( $rows as $row ) { // 利用 substr 去掉 開始 與 結尾 的 " $data_fields = explode("","", trim(substr($row, 1, -1))); if (count($data_fields) === count($headings)) { $data[] = array_combine($headings, $data_fields); } } return $data;}/** * 格式化json輸出 */function _json($string){ return json_decode(trim($string), true);}/** * 反序列化輸出 */function _serialize($string){ return unserialize(trim($string));}/** * 執行PHP腳本輸出 */function _php($string){ $string = trim($string); $populated = array(); eval("$populated = "$string";"); return $populated;}